Tue, 02 Aug 2016 17:39:38 +0200 wenzelm clarified: 'imports' is de-facto mandatory;
Tue, 02 Aug 2016 17:35:18 +0200 wenzelm support 'abbrevs' within theory header;
Tue, 02 Aug 2016 11:49:30 +0200 wenzelm tuned;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 +10000 tip